Moth-Eye-Engineered Flexible Films for X-Ray Shielding and Persistent Radiation Warning.

Area of Science:

• Materials Science
• Radiation Detection
• Nanotechnology

Background:

• Flexible radiation detectors face challenges in maintaining performance and stability in harsh conditions.
• Conventional scintillators often compromise either performance or durability.
• Developing robust, multifunctional materials for radiation applications is crucial.

Purpose of the Study:

• To design and fabricate novel bioinspired strontium aluminate@silica (SOD@SiO₂) composites for flexible radiation detection.
• To enhance material stability and performance under demanding environmental factors.
• To achieve multifunctionality including shielding, detection, imaging, and warning capabilities.

Main Methods:

• Synthesis of SrAl₂O₄:Eu²⁺, Dy³⁺@SiO₂ (SOD@SiO₂) composites using a scalable electrospinning process.
• Creation of a bioinspired moth-eye morphology via strong Al─O─Si covalent bonds.
• Comprehensive testing of material properties, including resistance to water, acids, and alkalis, X-ray shielding efficiency, detection sensitivity, imaging resolution, and radiation-induced luminescence.

Main Results:

• The SOD@SiO₂ films exhibited excellent resistance to water, acids, and alkalis, ensuring stable performance.
• Achieved high X-ray shielding efficiency (99.80% attenuation, 0.35 mm Pb equivalent).
• Demonstrated ultrasensitive detection of low-dose rate X-rays (0.43 µGy s^-1), high-resolution imaging (9.6 lp mm^-1), and prolonged visual warning (up to 20 h).

Conclusions:

• The developed SOD@SiO₂ composites offer a promising platform for next-generation lightweight radiation shielding and detection materials.
• The bioinspired moth-eye structure and robust covalent bonds contribute to superior environmental stability and multifunctionality.
• These flexible films overcome limitations of conventional materials, enabling applications in complex 3D structures and early warning systems.